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/* $OpenBSD: icu.s,v 1.33 2015/07/16 05:10:14 guenther Exp $ */
/* $NetBSD: icu.s,v 1.45 1996/01/07 03:59:34 mycroft Exp $ */
/*-
* Copyright (c) 1993, 1994, 1995 Charles M. Hannum. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Charles M. Hannum.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
.data
.globl _C_LABEL(imen)
_C_LABEL(imen):
.long 0xffff # interrupt mask enable (all off)
.text
/*
* Process pending interrupts.
*
* Important registers:
* ebx - cpl
* esi - address to resume loop at
* edi - scratch for Xsoftnet
*/
IDTVEC(spllower)
pushl %ebx
pushl %esi
pushl %edi
movl CPL,%ebx # save priority
movl $1f,%esi # address to resume loop at
1: movl %ebx,%eax # get cpl
shrl $4,%eax # find its mask.
movl _C_LABEL(iunmask)(,%eax,4),%eax
cli
andl CPUVAR(IPENDING),%eax # any non-masked bits left?
jz 2f
sti
bsfl %eax,%eax
btrl %eax,CPUVAR(IPENDING)
jnc 1b
jmp *_C_LABEL(Xrecurse)(,%eax,4)
2: movl %ebx,CPL
sti
popl %edi
popl %esi
popl %ebx
ret
/*
* Handle return from interrupt after device handler finishes.
*
* Important registers:
* ebx - cpl to restore
* esi - address to resume loop at
* edi - scratch for Xsoftnet
*/
IDTVEC(doreti)
popl %ebx # get previous priority
movl $1f,%esi # address to resume loop at
1: movl %ebx,%eax
shrl $4,%eax
movl _C_LABEL(iunmask)(,%eax,4),%eax
cli
andl CPUVAR(IPENDING),%eax
jz 2f
sti
bsfl %eax,%eax # slow, but not worth optimizing
btrl %eax,CPUVAR(IPENDING)
jnc 1b # some intr cleared the in-memory bit
cli
jmp *_C_LABEL(Xresume)(,%eax,4)
2: /* Check for ASTs on exit to user mode. */
CHECK_ASTPENDING(%ecx)
movl %ebx,CPL
je 3f
testb $SEL_RPL,TF_CS(%esp)
#ifdef VM86
jnz 4f
testl $PSL_VM,TF_EFLAGS(%esp)
#endif
jz 3f
4: CLEAR_ASTPENDING(%ecx)
sti
pushl %esp
call _C_LABEL(ast)
addl $4,%esp
cli
jmp 2b
3: INTRFASTEXIT
/*
* Soft interrupt handlers
*/
IDTVEC(softtty)
movl $IPL_SOFTTTY,%eax
movl %eax,CPL
sti
pushl $I386_SOFTINTR_SOFTTTY
call _C_LABEL(softintr_dispatch)
addl $4,%esp
jmp *%esi
IDTVEC(softnet)
movl $IPL_SOFTNET,%eax
movl %eax,CPL
sti
pushl $I386_SOFTINTR_SOFTNET
call _C_LABEL(softintr_dispatch)
addl $4,%esp
jmp *%esi
#undef DONETISR
IDTVEC(softclock)
movl $IPL_SOFTCLOCK,%eax
movl %eax,CPL
sti
pushl $I386_SOFTINTR_SOFTCLOCK
call _C_LABEL(softintr_dispatch)
addl $4,%esp
jmp *%esi
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